Just commit yourself to painting a little every night, or every other night, and slowly things will come together! Don't have everything sitting on your desk at once, as you'll be intimidated by the volume of work to be done. Instead, select, say, 10 models at a time, and just work on finishing them. Then, move onto another 10 models. All those lots of 10 will soon build up, and before you know it you'll have everything fully painted!
If you're looking to paint them quicker, you might want to look into the "Army Painter". In a sentence, you paint on base colours, and then dip it in their shading dip, and you're done! Some examples of this can be found below.
http://www.thearmypainter.com/gallery.php
It's worth mentioning that, if you go down this route, a Matt Varnish Spray - such as Vallejo's - is highly recommended. The dip leaves a very shiny, glossy surface that essentially ruins the model. A thin layer or two of Matt Varnish will take care of this.
Got any questions on the Army Painter? Let me know.